Lesson: Intermediate Problem Solving - 05t01

Estimating — Ratios

[Page 5 of 27]

Ratio problems also may allow you to establish a logical range for the correct answer and then eliminate choices outside of that range. Let's see how we would apply our estimation strategy to a ratio question.

Three donors made contributions to a certain charity in a ratio of 1 to 2 to 5. If they donated a combined total of $154, how many dollars did the donor who contributed the greatest amount give to the charity?
105
95
76
40
19
For the question above, use the values given in the stem to estimate your way to the correct answer. Fill in the Text Box below with your answer based on our new ratio, and then click Continue.

If the contributors gave equal amounts to the charity (a ratio of 1 to 1 to 1), each contributor donated approximately dollars.

If each contributor had donated an equal amount of money, then each would have given a third of the total dollar amount of $152, or about $50. But remember the ratio we are given in the question stem — 1 to 2 to 5. This ratio indicates that the most generous contributor gave far more than a third of the total pool of money.
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